Crown of Alysanne

Description:
A crown of gold. (The merlons atop the tower of the holdfast Queenscrown, a little south of The Wall, is said to have been painted gold in emulation of this crown in memory of Queen Alysanne Targaryen who once slept there).[5][6]

Crown of Joffrey I

Description:
A crown of gold crusted with rubies and black diamonds.[8][9] The crown is described as to big for young King Tommen but his queen mother, Cersei Baratheon-Lannister, thinks that he may grown into it.[10]

Description:
An open circlet of hammered bronze incised with the runes of the First Men, surmounted by nine black iron spikes wrought in the shape of longswords. It is said to look much the same as the one worn by the former StarkKings in The North.[17]

Crown of Jeyne Stark-Westerling

Crown of Salt and Rock

Office:
The crown of Salt and Rock, also referred to as the Driftwood Crown, denotes kingship over the Iron Isles, the Ironborn and their territories. Associated with the crown of Salt and Rock is the Seastone Chair denoting the same office. In times of the kingsmoots the crown was tossed into the sea whenever a king died and a new was made from driftwood after a new king was chosen.

Religious Crowns

Crowns of the High Septon

Description and History:
The crowns of the High Septon of Faith of the Seven is an immense crown of spun gold
and crystal that wreathed the head with rainbows when the wearer moves.[24][8][16] There have been two crowns in the course of A Song of Ice and Fire. The first went missing (and its wearer killed) during the Riot of King's Landing.[8] The second was a gift to the Faith and new High Septon from Tywin Lannister (the then Hand of the King) and much taller and more elaborate than the previous crown.[16] This second crown was sold by the faith, ostensibly to feed the hungry, when the next High Septon (known as the High Sparrow) assumed the position. This second crown is estimated (by Cersei) to add one and a half feet to the wearers height.[10]

Notable omissions

It may be noted that although Robert I Baratheon was the 18th King on the Iron Throne no mention is made of his crown. It is likely that each line of kings to preside over each of the many kingdoms that emerged throughout the history of Westeros bore a crown of some description.